(单选题)1: 属于Cable?Modem使用的工作频段为?(?) A: 10GHz~66GHz B: 5MHz~42MHz C: 2.4GHz D: 550MHz~750MHz 正确答案: D (单选题)2: 符合LMDS技术特征的有 ( ) A: 不需要视距传输 B: 采用CSMA/CD协议 C: 传输性能不受天气影响 D: 双工方式为频分双工...
(单选题)1: 宽带IP网络的基础与核心是( ) A: TCP/IP协议 B: 宽带接入 C: 传输速率为几至几十Gbit/s D: 分组交换 正确答案: A (单选题)2: 在IP协议数据报文中,标志字段的最低位如果为1表示后面还有分片的数据报,该标志字段的最低位是()。 A: CF B: MF C:...
(单选题)1: This year the farmers have produced twice ____________grain____________they did last year. A: as less ... as B: fewer ... than C: as much ... as D: as many ... As 正确答案: C (单选题)2: ___________, he slipped through the window....
(单选题)1: ____________you don't like him is none of my business. A: what B: who C: that D: whether 正确答案: C (单选题)2: Boris has brains. In fact,I doubt whether anyone in the class has ____________IQ. A: a high B: a higher C: the highe...
(单选题)1: No sooner____________to bed than he heard a knock at the door. A: had he gone B: he had gone C: did he go D: he went 正确答案: A (单选题)2: Today's weather isn't as cold as it was yesterday,____________ ? A: was it B: wasn't it C...
(单选题)1: "I'm sorry to have kept you waiting.""Oh, not at all. I ____________here only a few minutes." A: have been B: had been C: was D: will 正确答案: A (单选题)2: You were silly not ____________your car. A: to lock B: to have locked C:...
(单选题)1: RGB彩色空间中三个颜色系数均为0对应的颜色为( )。 A: 白色 B: 黑色 C: 红色 D: 紫色 正确答案: B (单选题)2: 霍夫曼编码存在两个主要问题是( )。 A: 没有错误保护功能和编码长度是可变的 B: 有损压缩编码和编码长度是可变的 C: 没有错误保护...
(单选题)1: 高保真立体声音频压缩标准的频率范围( )。 A: 50HZ-20KHZ B: 300HZ-25KHZ C: 300HZ-3.4KHZ D: 10HZ-25KHZ 正确答案: A (单选题)2: 索引色图像有( )个通道。 A: 3 B: 4 C: 16 D: 1 正确答案: D (单选题)3: 下列关于矢量信息和像素信息的描述,哪...
(单选题)1: 下列属于列车自动驾驶控制功能____________。 A: 车门监控 B: TOD显示 C: 自动调整列车运行速度 D: 超速防护 正确答案: C (单选题)2: 于完成计算车辆进出区段的轮轴数,监督列车占用轨道区段的一种技术设备。它不受轨道线路、道床状况的影响______...
(单选题)1: 下列属于列车自动驾驶控制功能____________。 A: 车门监控 B: TOD显示 C: 自动调整列车运行速度 D: 超速防护 正确答案: C (单选题)2: 根据应答器所传输报文是否可变,应答器可分为固定信息应答器(也称为无源应答器)和____________。 A: 摩擦应答器...